When plastic material is injected into a mold cavity, it is cooled and solidifies to from a part that is made to final part dimensions.However, if the cooling of this part in the mold is not uniform, differences in part shrinkage can occur, causing the part to distort.This condition is referred to in the injection molding industry as warpage. Warpage is also the result of excessive stresses that are built into a part during the molding process.
Causes:
1. An injection speed that is too fast will increase the melt temperature, forcing the melt to overpack the cavity. This overpacking creates molded-in stresses in the part, which warp the part
2. The injection speed is too slow, the viscosity of the material increases the amount of packing pressure needed to fill the cavity. This higher packing pressure adds molded-in stresses in the part, causing warpage
3. Long injection forward times contribute to part warpage by allowing more time for more material to overpack the cavity
4. Check ring wear can cause shot-to-shot consistency, creating overpacked parts
5. If the gate has not sealed off before the cavity is full, overpacking occurs, causing warpage
6. If not enough gates are used to fill a part, higher packing pressures occur to fill out the part, producing molded-in stresses
7. Smaller gate sizes cause a high degree of molecular orientation in the polymer that causes different shrinkage in different directions of the part (machine vs. transverse)
8. Insufficient cooling times do not provide enough time for the part to cool Increasing shrinkage
9. Running the mold halves at different temperatures can cause shrinkage in one direction to help overall warpage. Parts have a tendency to warp toward hotter mold halves since this causes higher shrinkage
10. If ejection forces are uneven due to ejector pin placement or length, stresses can be induced in the part causing warpage
11. Differences in wall thickness promote warpage since thin sections cool slower
12. Sharp comers can promote molded-in stresses that can cause warpage
Solutions:
1. Decreasing the melt temperature if the injection speed is too fast
2. Increasing the injection speed to decrease the holding pressure needed to fill the cavity
3. Limiting the injection forward time
4. Replacing check ring
5. The gate seal needs to be measured to assure that the cavity is not full before gate seal takes place
6. Increasing the number of gates reduces the packing pressure by distributing the pressure over a
number of gates
7. Larger gate sizes reduce orientation
8. Increasing cooling time or fixturing the part are options to prevent the part from distorting
9. Location and placement of cooling lines should be reviewed to ensure that even efficient cooling is
taking place to the part
10. Improving or modifying pin design can reduce
11. Uniform wall thickness helps avoid warpage part warpage
12. Removing sharp corners can reduce molded-in stresses and reduce stresses that can be caused
during part ejection
Place of Origin:Zhejiang, China (Mainland)
Model Number:Customized
Shaping Mode:Plastic Injection Mould
Product Material:Steel
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Place of Origin:Zhejiang, China (Mainland)
Model Number:Customized
Shaping Mode:Plastic Injection Mould
Product Material:Steel
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Place of Origin:Zhejiang, China (Mainland)
Model Number:Customized
Shaping Mode:Plastic Injection Mould
Product Material:Steel
The door is an important part of the auto interior parts . It is located on the inside of the car door. It is divided into front, rear, left, and right. It varies according to the car system, usually two doors and four doors. These parts are collectively called door panel series. The vehicle...
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We specialize in making injection mould, such as auto part mould, radiator tank mold, motorcycle parts mold and commodity molds etc.
We are professional in making kinds of auto parts mould. Such as car radiator water tank mould, fan and fan shroud mould, auto interior part mould, grille mould, ,fender mould, car light mould, car rear view mirror etc .
The door is an important part of the auto interior parts. It is located on the inside of the car door. It is divided into front, rear, left, and right. It varies according to the car system, usually two doors and four doors. These parts are collectively called door panel series.
Our company manufacturing high quality plastic injection mold like car radiator tank, mask grille, engine coolant tank, fan and fan shroud, car interior part, car rear view mirror.
Our company manufacturing high quality plastic injection mold like car radiator tank, mask grille, engine coolant tank, fan and fan shroud, car interior part, car rear view mirror
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Place of Origin:Zhejiang, China (Mainland)
Model Number:Customized
Shaping Mode:Plastic Injection Mould
Product Material:Steel
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Our company manufacturing high quality plastic injection mold like car radiator tank, mask grille, engine coolant tank, fan and fan shroud, car interior part, car rear view mirror.
Our company manufacturing high quality plastic injection mold like car radiator tank, mask grille, engine coolant tank, fan and fan shroud, car interior part, car rear view mirror.
We are professional in making kinds of auto parts mould. Such as car radiator water tank mould, fan and fan shroud mould, auto interior part mould, grille mould, ,fender mould, car light mould, car rear view mirror etc.
Place of Origin:Zhejiang, China (Mainland)
Model Number:Customized
Shaping Mode:Plastic Injection Mould
Product Material:Steel
Place of Origin:Zhejiang, China (Mainland)
Model Number:Customized
Shaping Mode:Plastic Injection Mould
Product Material:Steel
We are professional in making kinds of auto parts mould. Such as car radiator water tank mould, fan and fan shroud mould, auto interior part mould, grille mould, ,fender mould, car light mould, car rear view mirror etc.
Our company manufacturing high quality plastic injection mold like car radiator tank, mask grille, engine coolant tank, fan and fan shroud, car interior part, car rear view mirror
Our company manufacturing high quality plastic injection mold like car radiator tank, mask grille, engine coolant tank, fan and fan shroud, car interior part, car rear view mirror.
Place of Origin:Zhejiang, China (Mainland)
Model Number:Customized
Shaping Mode:Plastic Injection Mould
Product Material:Steel
Place of Origin:Zhejiang, China (Mainland)
Model Number:Customized
Shaping Mode:Plastic Injection Mould
Product Material:Steel
Place of Origin:Zhejiang, China (Mainland)
Model Number:Customized
Shaping Mode:Plastic Injection Mould
Product Material:Steel
We are professional in making kinds of auto parts mould. Such as car radiator water tank mould, fan and fan shroud mould, auto interior part mould, grille mould, ,fender mould, car light mould, car rear view mirror etc.
Taizhou Tuofang Plastic Mould Co.,Ltd has been focus on plastic injection mold and molding service ever since its foundation. We have professional engineering and sales team.
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This truck radiator tank mould is with ten interchangeable insert to make ten diffirent type water tank
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No. 71 Hequ Road, Chengjiang Street of Huangyan, Taizhou City, 318020, Zhejiang Province, China
